Sirchby

(31-1-2019) T30 Missing T35E1 HVAP

Tanks affected

  • T30

 

Bug

155 mm T35E1 HVAP (APCR) is missing

 

https://i.imgur.com/CHN0tEe.jpg

 

Bug description

The T30 in the game currently does not have the T35E1 HVAP. This at present is a problem for 155 mm T7, since it will not have any substantial AT capabilities to deal against heavily armored vehicles compared to the T29 and T34. It's the last remaining shell that the gun must have, with 4 of 5 shells are already available in the game (M112B1, M107, M110, T29E1).

https://i.imgur.com/v3rJhhB.jpg

 

Based from the AFV Technical Situation Report in regards to the T30 development, it was already anticipated that the APC(BC) (T29E1) projectile will only fire at low muzzle velocity, resulting in marginal penetration performance, prompting the necessity to develop an HVAP round.

https://i.imgur.com/DYun2mA.jpg

 

The HVAP was T35E1, a 155 mm projectile that was modified from M1 Long Tom's T35 HVAP, with structural design similar to 90 mm T30E16/M304 HVAP on the multi-piece carrier construction.

https://i.imgur.com/jCamQCl.jpg

 

The muzzle velocity as fired from T7 was 3100 ft/s (945 m/s), with the projectile weighing 57.2 lb (25.94 kg).

Royal Artillery Liaison Letter to the War Office, 1945.

https://i.imgur.com/N4quC8H.png

 

Penetration figure given from OCM 27195 outlines that the T35E1 performance is given at 178mm against 30° armor from 2000 yards, compared with 216 mm of the 105 mm T5E1.

https://i.imgur.com/yleDgxP.jpg

 

If we're looking for its vertical point blank penetration, we must extrapolate the numbers from the T35 first. Weight of the T35 is 56.5 lb (25.62 kg), & muzzle velocity at 3630 ft/s (1106 m/s) according to Aerodynamic Data for Spinning Projectile.

https://i.imgur.com/KxuQ956.jpg

 

Ballistic limit of the T35 HVAP versus rolled homogeneous armor from An Analytical Study of Data on Armor Penetration by Tank-Fired, Kinetic Energy Projectiles, 1958.
0° - 14.00 in (355 mm) - 3365 ft/s (1031 m/s)

https://i.imgur.com/dfKFD5C.jpg

 

So, we know the ballistic limit of the T35 at 1031 m/s. Measuring the penetration to point blank range should give around 392 mm of penetration as fired from 155 mm M1 Long Tom. Now, if we decrease the velocity from 1106 m/s of the T35 to 945 m/s of the T35E1, & add a little bit weight of it, the final result is 316 mm of penetration as fired from 155 mm T7.

 

155 mm T35E1 HVAP

Projectile mass: 25.94 kg (57.2 lb)

Core diameter: 90.1 mm* (3.55 in)

Core mass: 6.8 kg (15 lb)

Core type: Tungsten Carbide

Muzzle velocity: 945 m/s (3100 ft/s)

Penetration: 316 mm  0° Point Blank

 

Spoiler

*It's unknown how exactly big the core is. But assuming the core diameter-to-weight ratio of 90 mm M304 is used:

 

Projectile: T30E16 / M304
Weight: 7.62 kg
Core Diameter: 47.7 mm
Core Weight: 3.6 kg
Core Material: Tungsten Carbide
Core Diameter-to-Weight ratio: 13.25

 

If 90 mm core is used for 155 mm T35E1:

Projectile: T35E1
Weight: 25.94 kg
Core Diameter: 90.1 mm
Core Weight: 6.8 kg
Core Material: Tungsten Carbide
Core Diameter-to-Weight ratio: 13.25

 

The core diameter-to-weight ratio of both 90/47 mm & 155/90 mm is same.

 

 

The full extent of the T30 weapon development report is available here:

 

Bug fix

Add the last remaining shell, the T35E1 HVAP for the T30 with its aforementioned specification.
 
Source

Primary Sources:

  • Development History of the Heavy Tanks, T29 & T30, 1945
  • Royal Artillery Liaison Letter to the War Office, 1945
  • RAC – AFV Technical Situation Report, 1945
  • AD800469 – Aerodynamic Data for Spinning Projectile
  • AD301343 – An Analytical Study of Data on Armor Penetration by Tank-Fired, Kinetic Energy Projectiles, 1958
Edited by Sirchby
Additional source titles for each images
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Hi,

   Can you please provide the reference information for the sources cited.  Another forum that also does not identify the references used is of little use.

 

Please follow the guidelines and provide the information requested.

Quote

Historical Issues Referencing Information

 

The required number of References depends on the type of sources presented:
OEM Manuals    -  User Manuals / Repair Manuals / Factory Manuals etc (Flight/Pilot/Maintenance Manuals, Engineering Drawings etc) - Historically acknowledged reference sources - single source is required. (Preferred)
Authored works   -  Reference Books on collections of vehicles/aircraft/ships ('coffee table books') Biographies, Specialist Books, "Expert" opinion publications, websites, industry magazines etc - at least two unrelated sources required.*

 

*Please be reminded that Wikipedia or other private Websites are generally not considered as reliable sources.

 

  • Please ensure the references haveReport/Document Type, Report/Document Name, Author, Date, ISBN/ISSN, relevant Pg No's etc - so our Historical consultant can review and check the accuracy of those documents against the substantial Gaijin Historical Database and Reference Sources.
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Due to the faulty of page layout, the sources have been separated and put into this post.

 

Primary Sources:

  • Royal Artillery Liaison Letter to the War Office, 1945
Spoiler

https://i.imgur.com/ft6csWn.jpg

  • RAC – AFV Technical Situation Report, 1945
Spoiler

https://i.imgur.com/dZuu6xy.jpg

  • AD800469 – Aerodynamic Data for Spinning Projectile
Spoiler

https://i.imgur.com/1rYxxzP.jpg

  • AD301343 – An Analytical Study of Data on Armor Penetration by Tank-Fired, Kinetic Energy Projectiles, 1958
Spoiler

https://i.imgur.com/4OshPRG.jpg

 

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Thanks

 

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The bug report has been submitted.

For any questions feel free to PM me or any other technical moderator.

Thanks for your time and effort

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